Publication

Observation of Λ ¯ p →K+π+π-π0 and Λ ¯ p →K+π+π-2π0

2026

Abstract

Using (10 087±44)×106 J/ψ events collected with the BESIII detector at a center-of-mass energy of s=3.097 GeV, the antihyperon-nucleon annihilation processes Λ¯p→K+π+π-+kπ0 (k=1, 2, 3) are studied at an incident Λ¯ momentum of approximately 1.074 GeV/c. The reactions Λ¯p→K+π+π-π0 and Λ¯p→K+π+π-2π0 are observed for the first time, with corresponding cross sections σΛ¯p→K+π+π-π0=8.5-1.1+1.2(stat)±0.4(syst) mb and σΛ¯p→K+π+π-2π0=7.9-1.7+1.9±0.4 mb. No significant signal is found for Λ¯p→K+π+π-3π0, and an upper limit of 7.2 mb is set at a 90% confidence level. Evidence for the K∗(892)+ resonance is seen in the K+π0 invariant mass spectrum MK+π0 for k=1, and the corresponding cross section for Λ¯p→K∗(892)+π+π- is measured to be σΛ¯p→K∗(892)+π+π-=12.5-3.4+3.8±1.2 mb. Owing to the limited statistics, possible interference effects are not considered. These findings offer crucial input to deepen our understanding of the antihyperon-nucleon interactions.

Official source

https://infoscience.epfl.ch/entities/publication/59e8bf35-57fa-4497-a4e5-4e2aade30c3a

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/59e8bf35-57fa-4497-a4e5-4e2aade30c3a

About this result

Related concepts (32)

Approximations of π

Approximations for the mathematical constant pi (pi) in the history of mathematics reached an accuracy within 0.04% of the true value before the beginning of the Common Era. In Chinese mathematics, this was improved to approximations correct to what corresponds to about seven decimal digits by the 5th century. Further progress was not made until the 15th century (through the efforts of Jamshīd al-Kāshī).

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In mathematics, the prime-counting function is the function counting the number of prime numbers less than or equal to some real number x. It is denoted by pi(x) (unrelated to the number pi). Prime number theorem Of great interest in number theory is the growth rate of the prime-counting function. It was conjectured in the end of the 18th century by Gauss and by Legendre to be approximately where log is the natural logarithm, in the sense that This statement is the prime number theorem.

Hypernucleus

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